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RENAME(2)		   Linux Programmer's Manual		     RENAME(2)

NAME
       rename, renameat, renameat2 - change the	name or	location of a file

SYNOPSIS
       #include	<stdio.h>

       int rename(const	char *oldpath, const char *newpath);

       #include	<fcntl.h>	    /* Definition of AT_* constants */
       #include	<stdio.h>

       int renameat(int	olddirfd, const	char *oldpath,
		    int	newdirfd, const	char *newpath);

       int renameat2(int olddirfd, const char *oldpath,
		     int newdirfd, const char *newpath,	unsigned int flags);

   Feature Test	Macro Requirements for glibc (see feature_test_macros(7)):

       renameat():
	   Since glibc 2.10:
	       _XOPEN_SOURCE >=	700 || _POSIX_C_SOURCE >= 200809L
	   Before glibc	2.10:
	       _ATFILE_SOURCE

DESCRIPTION
       rename()	 renames  a  file,  moving it between directories if required.
       Any other hard links to the file	(as created using link(2))  are	 unaf-
       fected.	Open file descriptors for oldpath are also unaffected.

       If newpath already exists, it will be atomically	replaced (subject to a
       few conditions; see ERRORS below), so that there	is no point  at	 which
       another process attempting to access newpath will find it missing.

       If  oldpath  and	 newpath are existing hard links referring to the same
       file, then rename() does	nothing, and returns a success status.

       If newpath exists but the operation fails  for  some  reason,  rename()
       guarantees to leave an instance of newpath in place.

       oldpath can specify a directory.	 In this case, newpath must either not
       exist, or it must specify an empty directory.

       However,	when overwriting there will probably be	a window in which both
       oldpath and newpath refer to the	file being renamed.

       If  oldpath  refers to a	symbolic link, the link	is renamed; if newpath
       refers to a symbolic link, the link will	be overwritten.

   renameat()
       The renameat() system call operates in exactly  the  same  way  as  re-
       name(), except for the differences described here.

       If  the	pathname  given	in oldpath is relative,	then it	is interpreted
       relative	to the directory referred to by	the file  descriptor  olddirfd
       (rather	than  relative to the current working directory	of the calling
       process,	as is done by rename() for a relative pathname).

       If oldpath is relative and olddirfd is the special value	AT_FDCWD, then
       oldpath is interpreted relative to the current working directory	of the
       calling process (like rename()).

       If oldpath is absolute, then olddirfd is	ignored.

       The interpretation of newpath is	as for oldpath,	except that a relative
       pathname	 is  interpreted  relative to the directory referred to	by the
       file descriptor newdirfd.

       See openat(2) for an explanation	of the need for	renameat().

   renameat2()
       renameat2() has an additional flags argument.  A	renameat2() call  with
       a zero flags argument is	equivalent to renameat().

       The flags argument is a bit mask	consisting of zero or more of the fol-
       lowing flags:

       RENAME_NOREPLACE
	      Don't overwrite newpath.	of the rename.	 Return	 an  error  if
	      newpath already exists.

       RENAME_EXCHANGE
	      Atomically  exchange  oldpath  and newpath.  Both	pathnames must
	      exist but	may be of different types (e.g., one could be  a  non-
	      empty directory and the other a symbolic link).

RETURN VALUE
       On  success,  zero is returned.	On error, -1 is	returned, and errno is
       set appropriately.

ERRORS
       EACCES Write permission is denied for the directory containing  oldpath
	      or  newpath,  or,	search permission is denied for	one of the di-
	      rectories	in the path prefix of oldpath or newpath,  or  oldpath
	      is  a  directory	and does not allow write permission (needed to
	      update the ..  entry).  (See also	path_resolution(7).)

       EBUSY  The rename fails because oldpath or newpath is a directory  that
	      is in use	by some	process	(perhaps as current working directory,
	      or as root directory, or because it was open for reading)	or  is
	      in  use  by  the	system (for example as mount point), while the
	      system considers this an error.  (Note that there	is no require-
	      ment  to return EBUSY in such cases--there is nothing wrong with
	      doing the	rename anyway--but it is allowed to  return  EBUSY  if
	      the system cannot	otherwise handle such situations.)

       EDQUOT The  user's  quota of disk blocks	on the filesystem has been ex-
	      hausted.

       EFAULT oldpath or newpath points	outside	your accessible	address	space.

       EINVAL The new pathname contained a path	prefix of the  old,  or,  more
	      generally,  an  attempt was made to make a directory a subdirec-
	      tory of itself.

       EISDIR newpath is an existing directory,	but oldpath is	not  a	direc-
	      tory.

       ELOOP  Too many symbolic	links were encountered in resolving oldpath or
	      newpath.

       EMLINK oldpath already has the maximum number of	links to it, or	it was
	      a	directory and the directory containing newpath has the maximum
	      number of	links.

       ENAMETOOLONG
	      oldpath or newpath was too long.

       ENOENT The link named by	oldpath	does not exist;	or, a directory	compo-
	      nent  in	newpath	 does  not exist; or, oldpath or newpath is an
	      empty string.

       ENOMEM Insufficient kernel memory was available.

       ENOSPC The device containing the	file has no room for the new directory
	      entry.

       ENOTDIR
	      A	component used as a directory in oldpath or newpath is not, in
	      fact, a directory.  Or, oldpath is a directory, and newpath  ex-
	      ists but is not a	directory.

       ENOTEMPTY or EEXIST
	      newpath is a nonempty directory, that is,	contains entries other
	      than "." and "..".

       EPERM or	EACCES
	      The directory containing oldpath has the	sticky	bit  (S_ISVTX)
	      set  and	the process's effective	user ID	is neither the user ID
	      of the file to be	deleted	nor that of the	 directory  containing
	      it,  and the process is not privileged (Linux: does not have the
	      CAP_FOWNER capability); or newpath is an existing	file  and  the
	      directory	containing it has the sticky bit set and the process's
	      effective	user ID	is neither the user ID of the file to  be  re-
	      placed  nor that of the directory	containing it, and the process
	      is not privileged	(Linux:	does not have the CAP_FOWNER  capabil-
	      ity); or the filesystem containing pathname does not support re-
	      naming of	the type requested.

       EROFS  The file is on a read-only filesystem.

       EXDEV  oldpath and newpath are not  on  the  same  mounted  filesystem.
	      (Linux  permits  a  filesystem to	be mounted at multiple points,
	      but rename() does	not work across	different mount	 points,  even
	      if the same filesystem is	mounted	on both.)

       The  following  additional  errors  can	occur  for  renameat() and re-
       nameat2():

       EBADF  olddirfd or newdirfd is not a valid file descriptor.

       ENOTDIR
	      oldpath is relative and olddirfd is a file descriptor  referring
	      to  a  file  other  than a directory; or similar for newpath and
	      newdirfd

       The following additional	errors can occur for renameat2():

       EEXIST flags contains RENAME_NOREPLACE and newpath already exists.

       EINVAL An invalid flag was specified in flags, or both RENAME_NOREPLACE
	      and RENAME_EXCHANGE were specified.

       EINVAL The filesystem does not support one of the flags in flags.

       ENOENT flags contains RENAME_EXCHANGE and newpath does not exist.

VERSIONS
       renameat()  was	added  to  Linux in kernel 2.6.16; library support was
       added to	glibc in version 2.4.

       renameat2() was added to	Linux in kernel	3.15.

CONFORMING TO
       rename(): 4.3BSD, C89, C99, POSIX.1-2001, POSIX.1-2008.

       renameat(): POSIX.1-2008.

       renameat2() is Linux-specific.

NOTES
   Glibc notes
       On older	kernels	where renameat() is  unavailable,  the	glibc  wrapper
       function	 falls	back to	the use	of rename().  When oldpath and newpath
       are relative pathnames, glibc constructs	pathnames based	 on  the  sym-
       bolic  links  in	 /proc/self/fd	that  correspond  to  the olddirfd and
       newdirfd	arguments.

BUGS
       On NFS filesystems, you can not assume that if  the  operation  failed,
       the  file was not renamed.  If the server does the rename operation and
       then crashes, the retransmitted RPC which will be  processed  when  the
       server  is  up  again causes a failure.	The application	is expected to
       deal with this.	See link(2) for	a similar problem.

SEE ALSO
       mv(1), chmod(2),	link(2),  symlink(2),  unlink(2),  path_resolution(7),
       symlink(7)

COLOPHON
       This  page  is  part of release 3.74 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest	  version     of     this    page,    can    be	   found    at
       http://www.kernel.org/doc/man-pages/.

Linux				  2014-08-19			     RENAME(2)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | CONFORMING TO | NOTES | BUGS | SEE ALSO | COLOPHON

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